// stock2.cpp -- improved version
#include <iostream>
#include "stock2.h"
// constructors
Stock::Stock()        // default constructor
{
std::strcpy(company, "no name");
shares = 0;
share_val = 0.0;
total_val = 0.0;
}
Stock::Stock(const char * co, int n, double pr)
{

if (n < 0)
{
std::cerr << "Number of shares can't be negative; "
<< company << " shares set to 0.\n";
shares = 0;
}
else
shares = n;
share_val = pr;
set_tot();
}
// class destructor
Stock::~Stock()        // quiet class destructor
{
}
// other methods
void Stock::buy(int num, double price)
{
if (num < 0)
{
std::cerr << "Number of shares purchased can't be negative. "
<< "Transaction is aborted.\n";
}
else
{
shares += num;
share_val = price;
set_tot();
}
}
void Stock::sell(int num, double price)
{
using std::cerr;
if (num < 0)
{
cerr << "Number of shares sold can't be negative. "
<< "Transaction is aborted.\n";
}
else if (num > shares)
{
cerr << "You can't sell more than you have! "
<< "Transaction is aborted.\n";
}
else
{
shares -= num;
share_val = price;
set_tot();
}
}
void Stock::update(double price)
{
share_val = price;
set_tot();
}
void Stock::show() const
{
using std::cout;
using std::endl;
cout << "Company: " << company
<< "  Shares: " << shares << endl
<< "  Share Price: $" << share_val
<< "  Total Worth: $" << total_val << endl; 
}
const Stock & Stock::topval(const Stock & s) const
{
if (s.total_val > total_val)
return s;
else
return *this; 
}